.Dd July 26, 2014
.Dt DGEN 1
.Os
.Sh NAME
.Nm dgen
.Nd Sega Genesis/Mega Drive emulator
.Sh SYNOPSIS
.Nm dgen
.Op Fl Pfhmv
.Op Fl R Ar (J|U|E)
.Op Fl H Ar HZ
.Op Fl D Ar DEMONAME
.Op Fl d Ar DEMONAME
.Op Fl n Ar USEC
.Op Fl p Ar CODE,CODE...
.Op Fl r Ar RCFILE
.Op Fl X Ar XFACT
.Op Fl Y Ar YFACT
.Op Fl S Ar FACT
.Op Fl g Ar (0|1)
.Op Fl G Ar XxY
.Op Fl s Ar SLOT
.Ar [romname [...]]
.Sh DESCRIPTION
The ROM image in the file
.Ar romname
is executed, as emulated on a Sega Genesis or Mega Drive running in 60Hz NTSC
mode (unless the
.Fl P
option is specified, in which case 50Hz PAL mode is used).
.Ar romname
should be in raw binary or SMD format, and may be compressed with
.Xr gzip 1 ,
.Xr zip 1 , or
.Xr bzip2 1 .
.Pp
When
.Ar romname
isn't specified, DGen starts without a ROM. It can be loaded later from the
prompt. When more than a single
.Ar romname
is specified, they are executed sequentially.
.Pp
The options are as follows:
.Bl -tag -width Fl
.It Fl H Ar HZ
Use a custom frame rate, can be used to accelerate or slow down emulation.
.It Fl P
Emulate 50Hz PAL mode (as used in European models of the Mega Drive).
.It Fl R Ar (J|U|E)
Emulator region. Without this option, DGen uses the first region mentioned in
the ROM header. It should be combined with
.Fl P
for PAL mode. See below.
.Bl -tag -width Fl
.It (none)
Autodetect (NTSC, 60Hz)
.It Fl P
Autodetect (PAL, 50Hz)
.It Fl R Ar J
Japan (NTSC, 60Hz)
.It Fl R Ar J Fl P
Japan (PAL, 50Hz)
.It Fl R Ar E
Europe (NTSC, 60Hz, music will certainly play too fast)
.It Fl R Ar E Fl P
Europe (PAL, 50Hz)
.It Fl R Ar U
America (NTSC, 60Hz)
.It Fl R Ar U Fl P
Same as
.Fl R Ar E Fl P
.El
.It Fl f
Run fullscreen, if possible.
.It Fl h
Show a brief synopsis of all options.
.It Fl m
MinGW only. This option prevents DGen from detaching from its control console.
.It Fl v
Show the version number, and exit.
.It Fl D Ar DEMONAME
Play back a demo recorded with the
.Fl d
option.
.It Fl d Ar DEMONAME
Record a demo of the program running, which can be later replayed with the
.Fl D
switch.
.It Fl n Ar USEC
Sleep for a number of microseconds after every frame, to give time to other
processes.
.It Fl p Ar CODE,CODE...
Modify the ROM image in memory, using Game Genie or Hex style codes. Game
Genie codes are of the form
.Ar ABCD-EFGH
and Hex codes are in the form
.Ar 123456:ABCD .
To specify more than one code, separate them with commas (do
.Ar not
use spaces).
.It Fl r Ar RCFILE
Parse another rc file after $HOME/.dgen/dgenrc. Values in the specified file
override those in the preceding files.
.It Fl X Ar XFACT
Scale the window XFACT times in the X direction. XFACT must be a positive
integer.
.It Fl Y Ar YFACT
Scale the window YFACT times in the Y direction. YFACT must be a positive
integer.
.It Fl S Ar FACT
Scale the window FACT times in both directions. FACT must be a positive integer.
.It Fl g Ar (0|1)
Enable/disable OpenGL (if compiled-in).
.It Fl G Ar XxY
Desired window size (e.g. 640x480, 800x600, etc.)
.It Fl s Ar SLOT
Load the saved state from the given slot at startup (0-9)
.El
.Sh INTERACTIVE PROMPT
A minimalist interactive prompt inspired from
.Xr vi 1
can be used to perform various operations described below. It is triggered by
pressing colon (:), the default key. Command-line editing, history and
completion are supported.
.Ss Commands
.Bl -tag -width xxxx
.It {quit, exit, q}
Quit, or load the next
.Ar romname
from command-line, if any.
.It {load, open, plug, o} Ar filename
Load a given ROM
.Ar filename .
.It {unload, close, unplug}
Unload the current ROM.
.It config_load Ar filename
Load configuration from file
.Ar filename .
.It config_save Ar filename
Save current configuration to file
.Ar filename .
.It reset
Genesis reset.
.It {ctv_push, ctv_pop, ctv_none}
Manage the stack of Crap TV filters (if compiled-in).
.It calibrate Ar number
Interactive calibration of the specified gamepad (1 or 2). If
.Ar number
isn't specified, default to 1.
.It unbind Ar binding [...]
Remove specified bindings (variables prefixed with "bind_").
See
.Xr dgenrc 5
for more information about them.
.It vgmdump start Ar filename
.It vgmdump stop
Manages VGM dumping/logging. If the second argument is
.Ar start
VGM dumping will be started at the path specified by the third argument.
If the second argument is
.Ar stop
VGM dumping will be stopped and the dump finalized.
.El
.Ss Variables
All configuration variables from
.Xr dgenrc 5
can be displayed and modified interactively, with immediate effect.
.Bl -tag -width xxxx
.It {int_name, bool_name, key_name, joy_name, ...} {value}
Affect
.Ar value
to variable
.Ar name .
.It {int_name, bool_name, key_name, joy_name, ...}
Display current value for variable
.Ar name .
.El
.Sh FILES
.Bl -tag -width $HOME/.dgen/dgen/saves/* -compact
.It Pa $HOME/.dgen/dgenrc
Contains user settings for the emulator.
.It Pa $HOME/.dgen/dgenrc.auto
Generated file containing saved user settings.
.It Pa $HOME/.dgen/saves/*
Save states generated by the emulator.
.It Pa $HOME/.dgen/ram/*
Battery-backup RAM images, generated by the emulator for ROMs with save RAM.
.It Pa $HOME/.dgen/screenshots/*
Screenshots are generated there.
.It Pa $HOME/.dgen/roms/*
ROMs default search path.
.It Pa $HOME/.dgen/demos/*
Demos default search path.
.El
.Sh SEE ALSO
.Xr gzip 1 ,
.Xr bzip2 1 ,
.Xr zip 1 ,
.Xr dgenrc 5
.Sh AUTHORS
This manual page was written by
.An Joe Groff Aq joe@pknet.com .
.An Updated by zamaz Aq zamaz@users.sourceforge.net .
.Sh BUGS
There are known emulation bugs, see BUGS in DGen source package.
.Pp
.An Report bugs to Aq http://sourceforge.net/projects/dgen/ .